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研究了La_(0.5)Sr_(0.5)CoO_3等钙钛矿型氧化物电极的极化性质及它们对氧电化学还原的催化活性。发现在阴极极化过程中氧化物电极发生还原时,其电催化活性降低,电极阻抗明显增加,而在阳极极化过程中电极阻抗减小。讨论了影响钙钛矿型氧化物导电的因素及电极阻抗变化对电极性能的影响。
The polarization properties of perovskite oxide such as La_ (0.5) Sr_ (0.5) CoO_3 and their catalytic activity for electrochemical reduction of oxygen were investigated. It was found that when the oxide electrode was reduced during the cathodic polarization, the electrocatalytic activity decreased, the impedance of the electrode increased significantly, and the impedance of the electrode decreased during the process of anodic polarization. The factors which influence the conductivity of perovskite type oxide and the influence of electrode impedance on the performance of the electrode were discussed.